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<H1 CLASS="western">rrdFlotSupport module</H1>
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<P>The <A HREF="../../src/lib/rrdFlotSupport.js">rrdFlotSupport Javascript module</A>
implements a set of commonly used functions an classes that may be used while plotting
<A HREF="http://oss.oetiker.ch/rrdtool/">RRD files</A> with
<A HREF="http://code.google.com/p/flot/">Flot</A>.</P>
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<H2 CLASS="heading-2-western">Overview</H2>
<P>This module provides two types of support:
<UL>
<LI>Functions providing support in converting raw data into Flot-friendly format:
<A HREF="#rrdDS2FlotSeries">rrdDS2FlotSeries</A> and
<A HREF="#rrdRRA2FlotObj">rrdRRA2FlotObj</A>.
<LI>A class providing support for handling the plotting:
<A HREF="#rrdFlotSelection">rrdFlotSelection</A>.
</UL>
</P>
<H2 CLASS="heading-2-western"><A NAME="rrdDS2FlotSeries"></A>Function rrdDS2FlotSeries</H2>
<P>This function extracts a specific DS from a specific RRA and returns an object that
contains the data in format flot expects.</P>
<P>
Input parameters:
</P>
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<P ALIGN=LEFT>Parameter</P>
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<P ALIGN=LEFT>Description</P>
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<P>rrd_file</P>
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<P>An object of type <A HREF="rrdFile_js.html#RRDFile">RRDFile</A> or equivalent.</P>
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<P>ds_id</P>
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<P>Identifier of the desired DS (as accepted by
<A HREF="rrdFile_js.html#RRDFile">RRDFile.getDS()</A>).</P>
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<P>rra_idx</P>
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<P>Index of the desired RRA.</P>
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<P>
The output is an object containing:
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<P ALIGN=LEFT>Attribute</P>
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<P ALIGN=LEFT>Description</P>
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<P>data</P>
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<P>A list of datapoints suitable to be fed to <A HREF="http://code.google.com/p/flot/">Flot</A>. Each element is a (Timestamp in ms, value) pair.<P>
<P>An example of use with Flot:<BR>
<PRE>
var fd=rrdDS2FlotSeries(...);
var plot = $.plot("#myplot", [{data:fd.data}], options);
</PRE>
</P>
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<P>label</P>
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<P>The DS name.</P>
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<P>min</P>
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<P>Min and max timestamp in ms.</P>
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<P>max</P>
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<H2 CLASS="heading-2-western"><A NAME="rrdDS2FlotObj"></A>Function rrdDS2FlotObj</H2>
<P>This function extracts a set of DSs from a specific RRA and returns an object that
contains the data in format flot expects.</P>
<P>
Input parameters:
</P>
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<P ALIGN=LEFT>Parameter</P>
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<P ALIGN=LEFT>Description</P>
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<P>rrd_file</P>
</TD>
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<P>An object of type <A HREF="rrdFile_js.html#RRDFile">RRDFile</A> or equivalent.</P>
</TD>
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<P>rra_idx</P>
</TD>
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<P>Index of the desired RRA.</P>
</TD>
</TR>
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<P>ds_list</P>
</TD>
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<P>List of DS identifiers (as accepted by
<A HREF="rrdFile_js.html#RRDFile">RRDFile.getDS()</A>).</P>
</TD>
</TR>
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<P>want_label</P>
</TD>
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<P>Should the DS name be included as label in the output?
(If false, only the order distinguishes the requested DSs)</P>
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<P>
The output is an object containing:
</P>
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<P ALIGN=LEFT>Attribute</P>
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<P ALIGN=LEFT>Description</P>
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<P>data</P>
</TD>
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<P>A list of objects suitable to be fed to <A HREF="http://code.google.com/p/flot/">Flot</A>. Each element is an object composed of two attributes:<UL>
<LI>data - A list of (Timestamp in ms, value) pairs.</LI>
<LI>label - The (optional) DS name.</LI></UL></P>
<P>An example of use with Flot:<BR>
<PRE>
var fd=rrdDS2FlotObj(...);
var plot = $.plot("#myplot", fd.data, options);
</PRE>
</P>
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<P>min</P>
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<P>Min and max timestamp in ms.</P>
</TD>
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<P>max</P>
</TD>
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<H2 CLASS="heading-2-western"><A NAME="rrdFlotSelection"></A>Class rrdFlotSelection</H2>
<P>Helper class to handle <A HREF="http://code.google.com/p/flot/">Flot</A> selections.
</P>
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<P ALIGN=LEFT>Method</P>
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<P ALIGN=LEFT>Description</P>
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<P>reset()</P>
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<P>Clear the selection. (isSet() will return False)</P>
</TD>
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<P>isSet()</P>
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<P>Was a selection set?</P>
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<P>setFromFlotRanges(ranges)</P>
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<P>Set the selection to ranges.xaxis. See plotselected
<A HREF="http://code.google.com/p/flot/">Flot</A>
event for more info on ranges. (isSet() will return True, and getFlotRanges() can now be called.)</P>
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<P>getFlotRanges()</P>
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<P>Return a ranges object. See plotselected
<A HREF="http://code.google.com/p/flot/">Flot</A>
event for more info on ranges.</P>
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<P>trim_flot_data(flot_data)</P>
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<P>Create a new Flot data object by selecting only the data points within the current selection.</P>
<P>An example Flot data object is
<PRE>
rrdDS2FlotObj(...).data
</PRE></P>
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<P>trim_data(data_list)</P>
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<P>Create a new data list by selecting only the data points within the current selection.</P>
<P>An example data list is
<PRE>
rrdDS2FlotSeries(...).data
</PRE></P>
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<P>Pseudo-example of use:
<PRE>
myplotplot.bind("plotselected", function (event, ranges) {
// do the zooming
selection_range.setFromFlotRanges(ranges);
graph_options.xaxis.min=ranges.xaxis.from;
graph_options.xaxis.max=ranges.xaxis.to;
mygraph = $.plot("#mygraph", selection_range.trim_flot_data(flot_data), graph_options);
});
</PRE>
</P>
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